Furnace



E. P. COLE.

FURNACE.

APPLICATION FILED APR-1,1921.

. Patented Jan. 31; 1922.

222mm; cb'ze'. 13 w, WW 5 UNITETI sr EDWARD r. corn, F.CHICAGO,YILLINOISPASSIGIYQB, "r0 oonnmnnus nornarne COMPANY, or cnrcaeo, rumors, A-conroim'rron.

runnace.

T 0 allwhom it may concern Be it known that I, EDWARD ,1 Corn, a citizen of the UnitedState-s, and a resident of Chicago, inthe county of Cook and State of Illinois, have invented certain new and useful Improvements inFurnaces, of which the following is a specification.

The present invention relates to hot-air furnaces and particularly to the so-called single-registefi or pipeles's type comprising a heater and inner and outer casings providing an outer, clown-draft, cold air passage between the casings and an inner, up-draft, hot-air passage about the heater, and which passages communicate with each other at the furnace base and with a register in the floor above the furnace.

To prevent the 'transferof 'heat to the descending cold air from interfering with the effective'circulation of air through the furnace, the'inner casing is usually provided with a double wall providing a relatively narrow insulating sp'aceopen' at the lower tion or conesection of the inner casing above becomes highly the heater radiator. The ascending hotair and the descending cold air strike against this section of the inner casing so that it heated and sets up counter currents and eddies that check the flow of air, particularly in the cold-air passage, over this portionofthe inner casing. For these reasons, as careful tests have'shown, it; is

highly important :tognard against the'tr-ans fer of heatto the descending cold air at this point.

The present invention seeks to overcome the difiicultiesabove noted and to provide a simplified'and improved casing construction which will insure the effective circulation of Specification of Letters Patent. Patented Application filed A r-n1, 1921. Serial no. 457,792.

air and thereby increasethe efficiency of thefurnace. The invention consists in the features of improvement hereinafter set forth,

Jan 3151192 2 illustrated in the preferred form in the accompanying drawing and particularly pointed out in the appendedclaims. 7 i

In the drawing: Fig. 1 is a-vertical .Ii1g.'2[is a'detail longitudinal sectionron the line 2-2 of Fig. 1. i

Referring to the drawings,"the furfnzu'ze is section of the furnace,

provided with the usual combustion heater 5 of any suitable type." This heater is'mount ed 011 an annular base-6and include'san ash pit 7,. a fire box '8, a coi'nbustionchamb'cr 9, and a heatradiator 10 superposed, as usual, one above the other. I

The heater is surrounded by spaced 'cas ings 1'1 and 12." The inner casing-'11 pro- VldQSHlI-llP-dlflf-t, hot-air passage 13 about the heater. A downedrafhcold-air passage 14 is formed between; the inner and theoutercasings'and communications with the hot-air passage at the base of the furnace. The main vertical section of the outer casing 12 rests on a ring'15 at the'base ofthe furnace-and fits about the rib 16 on-this ring. Radial arms'17' connect this ring with the baseffi.

The main verticalsection ofthe inner cas 11' fits about the ring 18 and rests on the rib'j19 projecting laterally therefrom. This ring is supported by legs 20 resting o-n'the arms 17 soth-at the lowerend oftheii ner casing is located short distance above the base of thefu-rnaceand substantially ator slightly below the. level-of the lower-end of the fire-pot 8. Y

A ring 21 sim lar to the ring 1-8 fits within the upper end-ofthe main section ofthein-L ner casing. A taperedor conical section 22 of theinner casing or shell likewise fits about this ring 21 and restsn the rib 23 thereon.

An upper, vertical, section 24 opens-at -the' top fits over'the cone section 22. Airing--25 similar to the ring 21 fits within the top of themain vertical section ofthc outer casing or shell and a tapered or .coni'ca'l section 26,-

forming part of the ouiter shell, fitsabout this ring and rests on the -rib-27 thereon. An

upper vertical section 28 fits over the top of the cone=26 and forms part of the outer shell. A corresponding section 29. telescopes with the section 28 and is suspended from the register 3O seated in the floor ofthe room immediately above the furnace. v Means is provided for forming a relativel short, up-draft, air circulating and insulating space about the upper portion of the inner casing above the heater, and which insulating space communicates at its lower 1 inlet end directly with the down-draft coldair passage 14. As shown, the upper section 24 of the main inner casing terminates a slight distance below the reglster 30 and the air insulating space is formed by a supplemental inner or jacketing casing 31 which extends downwardly from the register 30 about the upper portion of the main inner casing and in spaced relation therewith and terminates, "at its lower end,above the level of the lire-pot 8 of the heater. In accordance with the'preferred embodiment of the invention, the supplemental inner casing comprises an upper portion formed-of telescoping sections and a taperingor conical section extending over the corresponding section of the main inner casing and supported thereon in spaced relation by straps 32 or other suitable means. The upper portion of themain inner casing and the supplemental inner casing thus form an up-draft air circulating and insulating space, which co mmunicates at its lower inlet end directly with the down-draft cold-air passage at a point adjacent the junction of the lower section and the tapering or conical section of the .Hlitlll inner casing. Atlts upper end the insulating space communicates with the upper end of the main Lip-draft air passage. With this arrangement the supplemental air insulatingspace does not, as in the prior structure referred to, communicate at its lower end with the clown-draft cold-air passage at substantially the same level as the main updraft hot-air higher level.

In order to prevent any radiation of heat from the lower vertical section of the casing 11, I have found it advantageous toprovide an inner lining 34 having a-reflecting surface, such as bright tin, preferably spaced slightly from the inner wall of this casing. Bosses passage, but at a substantially 35 or any other suitable means may be used tomaintain'this spaced relationship. The space between the casing and its lining is closed and, if desired, asbestos or other suitable insulating material may be placed therein.

A cast iron front 36 is secured to the rings 15 and 25 and has flanges at its side edges to which the lowermainsection of the outer casing 12 is secured by bolts or other suitable means, and vertical channel irons 87 connected to the front edges of the lower main sections of the inner and outer casings and connected together at their upper ends form a closure for the cold air passage. These channel irons 37 are spaced from the feed and ash pit snouts 38 and 39, inthe manner indicated in Fig. 2 of the drawing. Means, Well known in the art are also preferably provided for spacing the cold-air passages from the cleanout passage 40 of the front of the radiator and from the usual smoke fine that projects'from the rear portion of the radiator.

lVhen the furnace is in use, cold air enters the passage 14 through the outer portion 11 of the register and passes down wardly to the base of the furnace and beneath the lower end of the inner wall 11 into the hot air passage 13. The heated air rises in the passage 13 and is discharged through the central portion 42 of the register; 1

The cold; air passing downwardly in the passage 14 likewise enters the air passage 33 between the supplementary inner casing 31' and the. main casing 11 and passes upwardly over the conical and upper vertical sections of the main inner casing and is conducted. upwardly through this passage to the upper edge of this casing, where it enters the up per end of the main hot air passage.

Air fronrthe passa-ge l t is admitted to the relatively short insulating space or passage 38 before it hashad. an opportunity to become heated, but heat imparted thereto by the conical section 22 of the main inner casing causes it to riserapidly-within this passage. This circulation is also aided by the suction effect of hot-air discharged from the upper section 24 of the main inner-casing. Thus, while the conical section'22 acts as abaflie against which highly heated as? cending air strikes and becomes very hot,

the heat radiated therefrom is carried off by the relatively cool air which is maintained in effective circulation through the passage 38, and the conical section of supplemental inner casing against which the descending cold air strikes, remains cool and does not impart heat to the descending cold air in the passage 14;. The lower or main. vertical section of the inner casing does not becomehighly heated and the downward. movement of the cold air in the lower vertical portion of the passagela is rapid. Moreover, the lining 84 which forms an insulating space and has a radiant heat the heater, said casings providing main down andup-draft' a r clrcu atlng passages communicating at their upper ends with sa d reg'ister, and means-"providing an Lip-draft air insulating passage about the uppervportion of'said inner casing, both of 's ai'd updraft .zair passages communicating directly at their lower inlet ends with said downdraftair passages, the main up draft 'air passage-communicating with the down-draft passage at the base of the furnace andth'e supplemental sup-draft air passage communicating therewith at a substantially higher level.

2. In a hot-air furnace, the combination with a cumbustion heater having a radiator at its upper end and with a superposed register, of outer and inner casings about and extending above said heater and providing an outer, down-draft, cold-air passage and an inner, up-draft, hot-air passage in communication at their lower ends and communicating at their upper ends with said register, said inner casing having a conical section above said'radiator, and a jacket forming with said conical section an up-draft air passage communicating with said cold air passage at a point substantially at the base of said conical section.

3. In a hot-air furnace, the combination with a combustion heater comprising an ash-pit, fire-pot, combustion chamber and radiator in superposed relation, of outer and inner casings about and extending above said heater and providing an outer, down-draft, cold-air passage and an inner, up-draft, hotair passage incommunication'at their lower ends below the level of the fire-pot, said casings having substantially vertical upper and lower sections and intermediate conical sections above said radiator, and .a jacketing casing extending over the conical section of said inner casing and providing an up-draft air passage and insulating space communicating at its lower inlet end with said coldair passage at a point above the level of the fire-pot.

4. In a hot-air furnace, the combination with a combustion heater having a radiator at its upper end and with .a superposed register, of outer and inner casings about and extending above said heater and providing an outer, down-draft, cold-air passage and an inner, up-draft, hot-air passage in communication at their lower ends and communieating with said register at their upper ends, said casings having lower main and reduced upper sections and intermediate connecting sections, and a jacket forming with the intermediate section of said inner casing an ai passage and insulating space having its inlet communicating with said cold-air passage at a point adjacent the upper end of the main section of said inner casing.

5. In a hot air furnace, a combustion the register to the furnace base, said main around the upper portion of said main inner casing and terminating a: substantial dis- 7'5 tance above thelow'er'en d thereof, sai-d casings beingin' spaced relation'and providing main down-and up-draft aircirculating passages in communication at the base of the furnace, and a substantially shorter, updraft air passage or insulating space between the portions of said main air passages above the heater and communicating directly at its lower inlet end with said main down-draft air passage; Y 1 1 6. y In a hot air furnace, a combustion heater comprising an ash-pit, fire-pot, combustion chamber and radiator in superposed relation, .a register above said heater, an outer' casing, a main inner casing and a supplemental inner casing in spaced relation to form air circulating passages and having conical sections above the upper portion of said heater, said outer casing extending from inner casing terminating at its upper end below said register and. at its'lower end slightly above the furnace base, and said supplemental inner-casing extending down wardly from said register about the upper portion of saidinner casing and terminating above the level of the fire-pot. j V r 7. In a hot-air furnace, 'a. combustion heater having a radiator at its upper end, a superposed register, an outer casing extending from the register to the furnace base, a maininner casing terminating at its lower 'end slightly above the furnace base and at its upper .end slightly below said register,- said casings having upper and lower substantially vertical sections'and intermediate conical sections, and a second inner casing extending from said register downwardly about the upper vertical and conical sections of said main inner casing and terminating 7 adjacent the upper end of the lower vertical section thereof, said casings being in spaced relation to provide main down and up-draft air circulatmg passages and an intermediate u-p-draft air circulating and insulating space about theupper portion of said main inner casing.

8. In a single-register hot-air furnace, a combustion heater, and outer and inner casings surrounding said heater and havingreduced portions extending above the same, said casings being in spaced relation and providing main down and up-draft air circulating passages communicating at the furnace base anda substantially shorter intermediate up-draft air circulating and insulat ing space arnanged between the portions of said passages above the heater andhaving its lower inlet end in direct communication with said down-draft air passage.

9. In a hot air furnace, a combustion heater, a superposed register, outer and .inner casings surrounding said heater and having reduced portions extending above the same, said casings bein in spaced relation and providing down an up-draft air circulatingpassages in communication at their lowerrends and communicating With said register at their upper ends, the section of the inner casing immediately surrounding casing above the heater having an outer jacket spaced therefrom to provide an updraft aircirculatin and insulating space having its lower in et end communicating with said doWn-draft air passage substantially at the level of the upper end of said heater.

EDWARD P, com, 

